Liquid fuel burner



Jan. 5, 1937. R. M. SHERMAN LIQUID FUEL BURNER 2 Sheets-Sheet 1 Original Filed March 29, 1934 12023133025 M Jficrzzm Sheets-Sheet 2 R. M. SHERMAN LIQUID FUEL BURNER Original Filed March 29, 1934 ml mi ll I 1 UWHWHnm Jan. 5, 1937.

I raves 250 Ralision 118mm,

Patented Jan. 5, 1937 UNITED sTATEs LIQUID FUEL BURNER Sherman, Glastonbury, Conn, aalignor to The Silent Glow Oil Burner Corporation, Hartford, Conn.,- a corporation of Connecticut Original application March 29.1934, Serial No. 717,967. Divided and this application October 2, 1935. Serial No. 43.238

2 Claims.

This invention relates to apparatus for burning liquid fuel and more particularly burners of the so-called gun type, and has for its object to simplify the construction, reduce the expense of manufacture and render the burner conveniently accessible after installation for purposes of cleaning, repair or adjustment.

This application is a division of my prior application, Serial No. 717,967, filed March 29, 1934.

These and other objects of the invention will be best understood by reference to the following description when taken in connection with the accompanying illustration, while its scope will be more particularly pointed out in the appended claims.

In the drawings:

- Fig. 1 is a front view of a burner embodying one form of the invention and looking back from the mouth of the burner nozzle;

Fig. 2 is a cross-sectional elevation of the conduit on the line 22 of Fig. 3, looking in the direction of the arrow;

Fig. 3 is a detail in cross-sectional elevation showing the forward portion of the tubular conduit;

Fig. 4 is a sectional elevation taken through the upper one of the two separable parts of the casing, showing such parts removed;

Fig. 5 is a side elevation ofthe lower one of the two separable parts of the casing, showing the fan impeller and other parts exposed by the removal of the upper separable part;

. Fig. 6 is a side elevation of the burner shown in Fig. 1; and

Fig. 7 is a plan view, partly broken away, showing the upper separable part of the casing removed. q

Referring to the embodiment of the invention here submitted for illustrative purposes, the burner is equipped (Figs. 5 and 7) with a rotary air impeller it having a central air intake and of the so-called Sirocco type. The impeller is mounted on a driving shaft l3 and comprises a disk l5 and a spaced opposed annular plate H, with interconnecting multiple vanes or blades. On one side of the impeller and connected to the driving shaft I3 is mounted the electric driving motor I9 (Fig. 1), and on its opposite side and connected to the prolonged end of the driving shaft isthe oil pump 21.

The impeller is contained within a housing 22, the upper part of which is of a generally cylindrical form, having its end wall or head facing the motor closed except for the opening through which the driving shaft extends, and the opposite side or end wall facing the pump providing an air admission opening 23 aligned with the opening of the annular plate of the impeller. The amount of air admitted through the air admission opening is controlled by a diskshaped shutter 25 (Fig. 1) which may be adjusted to a fixed position after the burner has been installed and its air requirements determined.

The impeller, which rotates in the direction of the arrow shown in Fig. 5, is mounted in eccentric relation to the peripheral walls of the housing 22, so that the clearance between such walls and the impeller is at a minimum at the point designated 21 in Figs. 4 and 6 (which may be termed the point of air registry) but gradually increases from that point to the air discharge portion of the housing at the bottom thereof. At the bottom or air discharge portion of the housing, the latter merges into a prolonged, straight, cylindrical, tubular air conduit member 29 having an open mouth at its forward end and extending in a general direction at right angles to the axis of rotation of the impeller and in a tangential relation to the discharge portion of the housing, so that the mass of air is urged in a straight line direction from the impeller to the mouth of the conduit without other obstruction than is ofiered by the parts contained in the conduit and hereinafter described.

Positioned axially within the conduit is an oil delivery pipe 31, terminating just short of the conduit mouth in a nozzle 33 and entering laterally into the conduit at 35, where it has external connection to the oil supply pipe 31 extending to the discharge side of the pump 2|, the supply pipe 39 for the pump being connected to any suitable source of supply (not shown). such as a main storage tank. The usual accessories, such as reducing valves, strainers, etc., are omitted for the sake of simplicity. Liquid oil without premixturewith air is supplied by the pump to the nozzle.

To ignite the commingled oil and air, one or more sparkling electrodes 4| (herein two in number) are employed positioned in advance of the nozzle and connected each to a conductor 43, the latter being mounted in rigid, non-conducting sleeves 45 of porcelain or other like insulating material, the conductors entering the conduit through the bottom walls thereof at the points designated 41 in Figs. 6 and 7.

The motor rests on and is secured to a plate or shelf 9, and the pump to a similar plate 5|, both of which may be formed integrally with the impeller housing. Lugs 53, 55, and 59, de-

pump plate II and the conduit 29, provide means for attaching the burner to supporting legs or other supporting means when the burner is installed. On the installation of the burner, the

forward endof the conduit is entered into and of the conduit terminating preferably substantially flush with the inner walls of the combustion chamber, and the combustion chamber being sealed against the admission of air other than that delivered through the conduit, so that the entire air supply for combustion is delivered through and released from the open mouth of the conduit about the liquid oil spray delivered from the nozzle 23. I .v

To maintain the nozzle in central position and the electrodes in fixed relation to the nozzle, a support II is provided in the forward end of theconduit (Figs. 2 and 3), and to reduce to a minimum the obstruction to air flow, such support is formed by bending up three pieces of thin sheet-metal which are screwed or clamped together about the sleeves ll and the oil pipe 3i. thereby providing a three-point sheet-metal support presented edgewise to the air flow and fitting loosely against the inner walls of the conduit.

After the burner has been installed occasional inspection of the nozzle and electrode connections may be required. Continued use also tends to the accumulation of dirt and dust on the blades of the impeller, reducing its emciency and affecting the combustion by reducing the amount of air which should be supplied. As a means for providing instant access both to the impeller and to the nozzle and electrode connections, and at the same time as a means for materially simplifying the construction and reducing the cost of manufacture, I have formed the entire casing for the enclosed burner parts out of two interfitting but separable castings. Such casing comprises both the impeller housing and the tubular conduit, and with these also, in the illustrated embodiment of the invention, it additionally comprises the supporting parts for the motor and pump extending laterally from the impeller housing.

As shown in the drawings, the casing comprises a lower casting (Figs. 5 and '7) which ineludes substantially the lower half 22- of the impeller housing 22 (with the attached plates 49 and ii), the entire forward part 29 of the tubular conduit unbroken and intact where it passes through the combustion chamber walls, and substantially the lower half of the intermediate portion 28 of said conduit. Such casing further comprises an interfltting and separable upper casting (Fig. 4) which is removable as a single piece, and includes substantially the upper or companion half 22 of the impeller housing, carrying the point 21 of air registry and.

the upper or companion half 28 of said intermediate portion. of the conduit. The upper separable part of the casing is provided (Fig. 4)

securely in place but may be instantly removed by loosening the three set screws.

It will be observed that the separation of the two parts is along a horizontal plane in the impeller housing, intersecting the axis of the impeller,"' and a horizontal plane coinciding sub- -stantially with the axis of the conduit and along an intermediate plane extending diagonally from the axis of the impeller to the point of the lateral entrance of the oil nozzle pipe, the connection of the latter, however, being left intact in the lower --one of the two separable parts.

- The result is that the entire casing, the major part of the air conduit and the support for the burner parts are produced from two relatively simple castings, avoiding the necessity of the careful and expensive machine work usually required. The entire structure is supported at three points of support, one is beneath the motor, one 55 beneath the pump and one I. beneath the forward midportion of the air conduit. After the burner is installed, all working parts of the burner within the casingv (as indicated in Figs. 5 and 7), including not only the fan but the electrical connections and oil pipe connections within the air conduit, may be instantly opened up for inspection, cleaning, repair or adjustment by merely loosening and lifting away the single separable upper part of the casing.

While I have herein shown one specific embodiment of the invention, it is to be understood that the details and arrangement of the burner herein disclosed are submitted for illustrative purposes and that extensive changes therefrom may be made, all without departing from the spirit of the invention.

' I claim:

1. A liquid fuel burner having a rotary vaned air impeller, a casing comprising a housing in which said impeller is eccentrically mounted and an adjacent prolonged tubular air discharge conduit tangentially related to the discharge portion of said housing and terminating in an open mouth, a liquid fuel supply pipe entering and extending through said conduit and terminating in a nozzle near said conduit mouth, and electrical I connections also entering the air conduit and exthe upper adjacent major part of said tubular air conduit, whereby, through the removal of the upper portion of the casing, the major portion of the impeller is exposed to view and the interior of the major part of said air conduit may be opened for inspection.

2. A liquid fuel burner having a rotary vaned air impeller, a casing comprising a housing in which said impeller is eccentrically mounted and an adjacent prolonged tubular air discharge condult tangentially related to the discharge portion of said housing and terminating in an open mouth, a liquid fuel supply pipe entering and extending through said conduit and terminating in a nozzle near said conduit mouth. and

electrical connections also entering the air con- 1| duit and extending to sparking electrodes-adjacent said nozzle, said casing being formed of upper and lower interfltting but separable parts each of which is an integral casting, the lower one of which parts constitutes the bottom portion of said housing, the lower adjacent major part of said tubular air conduit and a complete forward discharge mouth for said conduit, and the upper one of which parts is removable as a single piece 10 and constitutes the upper portion of said housing and the upper adjacent major part of said tubular air conduit, said impeller housing portions being separable along lines extending from the impeller axis horizontally rearward and diagonally forward and downward, whereby, through the removal of the upper portion of the casing, the. major portion of the impeller is exposed to view and the interior of the major part of said air conduit may be opened for inspection.

RALLSTON M. SHERMAN. 

